As i describe on the title i have downloaded several programs like (call blocker , Blocker , black list , ..... ) and was trying to block contact with special blocking mode ( airplane mode ) when him/her calling me it appear that i turned off my mobile.
finally i cannot found program do this operation , all program just hang up the call
then i uninstalled all this program BUT THE PROBLEM IS THAT (((THIS CONTACT STILL BLOCKED)))
now how can i unblock this contact ??

note:
*nothing in rejecting call - in call setting
*i try to install all this programs again & unchecked this contact from blacklist but no way

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